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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18244eefda9de3efbe36fbd13b24f3645396fd05bc4868b240b34be9f21ae0a3' 
  AND token = 'JaPzGCorPRYmVxStl8vV2+jsY04OKP8eAeT7FG4hh30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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