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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e618ce85200dc129bfa124f2813d7a1d7b880f5d73927107b0bfdaf8bdacbb77' 
  AND token = 'J/xjWeqEEXHib+OdeyMyw89or6BtwV/2gxgp63o0d8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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