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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d9c75ef6d2b110a75b6f9ba1abfc3872b43aa2e7562989725a6b2f00e41092' 
  AND token = '1KfnMZ+/LGjfb9KC4rWU9gvDFB6cPaCypuWDjUsZcR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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