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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4fe44d980a364216e330a6b044b700086accce66b591159df97b08817267cf4' 
  AND token = 'lirwjrVZ8SIg3iMxcATa6RzUqXobADMjgFgW/EqYiF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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