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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b258711c9635021add91f6f03b0ea44002ce2b611155b8cab002f12f5fa15973' 
  AND token = 'iRkGzk3UpjBrQnBs7Gfp1zIRghivDSf9ikVlQ8f+0A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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