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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb426198220f7c4b4082cabf234db3e6a019535eb338f1f7027d259e367a12e' 
  AND token = '565il9HCg30mG6FOeSlBocC2KBqI13Ztk/nrt/VrgFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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