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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd542a2361946bd13a2144c336323c265e4c610e800e3d15cd4435e713a54ea92' 
  AND token = 'TGNBx3c4GqAjuUbrc0XugE/guBnwXjARPU77yrAI2QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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