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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '773eb74f23bbf7f0ca847046668f6b87cc079f713d3338b6585ba6996f75adfb' 
  AND token = 'Jmm1klCkteQ/IrPZJDCNXD5Ccyqm2IYHExcx7TxlzwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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