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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a81419bdde26cd07f872812273675aa881a3082ce5b8a50d05ff172062e20d7d' 
  AND token = 'RNuRNW/UClzJ/hjGkVkyKD33dIbbI4Wv+b/InX6YJV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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