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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c98e694f539c17de87781096ad59557d8e13b4357fb546192d456f577d5196' 
  AND token = '6Ny6Xf6uImsWwPHaBK49C8lI8DG/v74QzUvic/rNvGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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