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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03b755854fdc687672c3eaf086f359fd0a04dc97c7eb50766d8c55d26aca5ea1' 
  AND token = 'r7EtlH0BwdIZD4cIPBTLXc1YfX892z1qH5anCpZEkDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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