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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba20d6000c5d315abee64081222922f4c8e78a81c85279caca3a6dc9d173f137' 
  AND token = '0QmnNZ62V3ilT9EK2HTv5KS/aVbrV2hCuP3lBoUborE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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