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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3ea7ca6f1e2cbe4c4bc4a84ecdf56f59a121116b62275345be3bf7fa542e44' 
  AND token = 'yUuqJrGVDcf9adjxG5hj1Mz5VVngdhjR0D/1emdMNZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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