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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546d6dfa0a7f9b465234b03d3bf05270c7b4d01947b5176bd91aaa2bc1b3ad24' 
  AND token = '41bTGwx2H0HoE04mEl36n856N6WSUET75oEi8FgbOcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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