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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a4a21e12bd8375ace9c1289e1f2d06e98794c19a79ed555e6fde8d8c0936e7' 
  AND token = 'XVFF4fWcFUQqQfvdtR4HZbKD4w/InaImvj0736vMk54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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