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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ee751bcf5cf424e6dd03a99646798fd88b3418e4df50a052a00e819557c0c7' 
  AND token = '0Qzszh9mbl6E+Tl4+7GVG0zkIrzjWlt6h7ftsuJ+024=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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