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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e8bf3389d619c4e6f5f80bcc06f6fd183027d69025e6e785e1391becc1b6c8a' 
  AND token = '0dudVEgm3rVX7tt1YOPv9E+kXmdfNj7D4ZIkGSUq11Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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