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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeaec7d970eb58b5d5f0b285fac2dbbd64009eda3fa720e29cb4c59a83eb685c' 
  AND token = 'a9S8qBm4L/Fdj0rL2gPA36RsZyuKJ47sviwp8WBJ/Xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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