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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b7edf2b2bb3983c4c7434e2f167704bf0f89612c1697910cadd4fdc9bf366f' 
  AND token = 'bISX7w7drTeL7wIexTs1rpYqaQfuSPfwDTxAfst1sEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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