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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '564df3422885044e7dedb92dcfc34ce15deebde6d3a5fad8de57e2c363257aca' 
  AND token = 'QrSDNLHeP+bI2JF1x8CMBCHGs+xSv/hBh+l5xzd1vdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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