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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '911e90602c500ff3e68e143850b03c135f0c11dd8e0778063274f747134b1d3d' 
  AND token = 'UBhUHmRCLIvKrAEnUtg0XHdiF2H5W1oiNGqR3h7Edok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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