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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360b0eda88c5b644961cde1815177688fc393ded0313df9e0529ee5be33c24d4' 
  AND token = '30tAGAviZoyYCz3m2n7Ld0jSXIH4fOzv2Ep+q+lp93M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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