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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8f6b0aa7516909f6c1a8c5e429e59339e223cd9be69eaca67cb1f122ef8a7f1' 
  AND token = 'Bya52YHh0NivOtuo/PU0Z/b6AtlE+ddHir4eWqrsPAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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