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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de90534e452d7cf06dd4c346896200977cd95e0b9d146de83d73f277ef3d8e9' 
  AND token = 'oJY7ka7m5Wr2ZifoIwhjvf1qOY5a+ObUcnaTcC+xE24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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