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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b52df63b33eac82edbf59d19d30320b36509f2bdfe113de59fef1465229f02a6' 
  AND token = 'jG8PS0jrPF1JxjQzv1qvowV85gc5jpULYMAFJbkJz7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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