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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96edc462e10f1f8890c7d9f0eded97c09a3a9a936f43b43b896c16375b53fc4b' 
  AND token = 'ZuNQcDHlkVIhxpQjdDucQmexOXbLmNjfl306l+/nlAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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