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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f711d315c227b37cdeb7352d1ff46681fed3ed3a5a823bb481e41bd125c5ddc1' 
  AND token = 'UCNHNlXSRevTWfUVsbDvRk+BHhPOk1wJnu6h6j8bKVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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