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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f20c35c839a404f986ff12be70dd90f81bb9960da29186ebffabc0cda1e3e81b' 
  AND token = 'UMGxSsA7Zikly7QeRoB1OHZsmtaXy4mCO7s2lrJrK+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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