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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '350aec0fe614cc500f6fb6c1f979e18d26b70faba5de2f35e588de62133b790f' 
  AND token = '4AGVanBXjGqoasoub17OQl8umGdnm9wUjyhDT9l5HR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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