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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9123e46f99e2fc8abe258757b50a30df4d079eb112c62c5abd11ddb6e5f9f825' 
  AND token = 'RL/CoymOAvG1eJZBmJPnI3u80lBy8A3m1jzzZNtM2gE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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