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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e264373ae8b594d9b6238dded9da760976caad60a936ab32ea10ecd95481940c' 
  AND token = 'FhFK018CStCmo4H2mNyszE2SP2wUwF0yWEzmHBERFm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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