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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f703463a67dd383d3a3c94604b584f226600b58018eb8c4e13e70d60c96d08f' 
  AND token = 'KUHzzev28ma66v4ILTtgqnB5HI0v7OKBunqnQEts/vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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