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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '011faf80be6e93cd3855d72d888cc8d829003c0a10956f23d29b70b8a4911c68' 
  AND token = 'IudIrQz7kSXNieSXs4D69Qzqy4WPmDQEXEHmj8GXkHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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