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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dba805dfe2539b50e789beaa8dfc363c75868764160f19ae8c268acba2350b' 
  AND token = 'j6l9X8rcOqxkjbovL7/hco8VUUehEy241PvfBbJx9k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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