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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5695aa65008cb15771b676559870f2f4aaa592e4d902f6448c8b94c0b5069a7b' 
  AND token = 'w0IfRD6jjhVqpahUB4cqgxVs++1iIyw2JY3S6jpl6Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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