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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab9f09dd090f5f187dfd2f76f7545504f2d9a8c04d634cca6a0b8ea58a507026' 
  AND token = '+n8koIt3R1ndgiWT+fDlpOT4cVA785WYZNJTC5WI590=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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