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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ff4f92a833a04dc70b013aa10ae68f122d7b1bf1c5789483d6f1f46c5b7f244' 
  AND token = 'z99gLi4tjLiJLVahVDm6H05oEfdlVAHro9J1Y6EpbzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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