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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c852df00d2fa64ff2ae8f80ed98bb8c5ed1d8e8eb3e711183111e834809a0df1' 
  AND token = '/7CUp/HSyAhmwyGpRhBcwUbHuDhD7DUbLgmgJW0s0KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}