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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ba833faf35f784ca30fd1696556da1f06d6251dea632d851f30f98aa141d8a2' 
  AND token = 'Q9SXHdXpBOi8Mbn7hlIb3SpmQbwskSkm9h7iCHZsAUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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