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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d96f1608b4a0b49ad98760cf0676d421d7233934f438c9e737f32d7d7f498e2' 
  AND token = 'SBwTYiCndKhSLgaybqXi53AIcrBwXLmo94UvR5x/oSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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