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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5acf9264eb72dbc1f996e6baed57211170b484d9cf2af900c7864cd7c3ed34e' 
  AND token = 'sAlt/Icr83+4bi8no86Fyu/vqMUP0nEUS9Ew3oECf0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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