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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26de706a497632481dd3c7a97f4c3bcb139109d48c1118942dd19897d23c8460' 
  AND token = '0m7I/TlIC6diO+iDuC5zLtGUkvSWYyJYGIXLoa1uRa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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