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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b6e36c83b84765ec71f0caa43440cab297beb154615c8cc592a7993729e0b94' 
  AND token = 'I6UW+TLE2ruE9/QA6O3eoIAFhEwToZfFYoJ6aM+tofE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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