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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e81732d027083c0914b06a49f44e8ec7cce3efeee19761c3513417ff086476a' 
  AND token = 'adiaPNFizk+T4kC5LOBhQCponelJprrTH3nS5edBCLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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