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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afefd5e6ae9d924bdc845c95754b6b8564e0b480ff427d59adedbecae01ef0dc' 
  AND token = '13+0sGELd20Hn0VEDkRDdOCBwzgDz03DbISXR10UA9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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