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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fd91affa7075cd8ad1186ee5d97fb2fde6dbc82a644af607aa94901ac94b56' 
  AND token = 'p347/VMn9UeNk/t29nsOHeYGSvx/l3J0IMofnkOwzrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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