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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9b896faea081a70c41e42ef7397ab19302542e99ba0db9ded6652bc5b34419' 
  AND token = 'Lsh27EHLw0gQymvLNL5FglrmJz1t/7aHsoA1W9LWUHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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