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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b61edfd41274b19906e2bad4442634e4f32c31896de12d172344e7e3bf9f9eea' 
  AND token = 'v+69zAfoRsqHZMtR5GfFCU0QAyZ6hqaTiXgCmhKh5dU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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