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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de9dbe2480e9ad62f6d105eeeef1ed9b826c406e820a36557d2dc6a63eb4909' 
  AND token = 'sCp/c0/sowWGzERa6pZWdmEGY4Df4h9XQ/PjLSPdW7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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