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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee1509a45f62f47cf7a7c257acee381c8ef311f540e5245b6efcf69e50791c2c' 
  AND token = 'oLxp1JIJbhgy6BQVy/KNMUURSAx3riKCXC/I49eH5u8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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