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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb08a02a8499222c6a476879991b4e1ac275db443bed75623428106979ee9c26' 
  AND token = 'Zy4ZhQeAa3tCQVwiqA+C2ANyFY0yoMdUlH/t5v3TDhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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