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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98cc54636a3084eb52b16aa56a4c851273d1c00456781a926b713577f2da7ee' 
  AND token = 'A66W6WlXJ1+BWkOPbArr1lFoSiKymga8ExurC3I6EEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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