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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d617ce9d5848220d4b6efdfae91253696a703b47a8b2fe200271daffe72bb1' 
  AND token = 'LDzNy+cffBN2BbS+nfJR4YHD8lpuxqgL5WN1rLj1hVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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