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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aba853c82172b50915cf38ae0e38d8b86a93d1f8ca77dd3a776e527568072a4e' 
  AND token = 'zgFJbak9H+Tkw6z3uwoNw5f8PKhHFFFGXDptnGfvQQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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