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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '821cd87b0917051d8b98470df941a2cd28def493f5288a20d03444ea7be07638' 
  AND token = '1qR65wQ569svLPlX98wanYVplZlxsh8CjOui/MWs7Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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